RE: [SI-LIST] : What's your favorite Screwy SI Concept?

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From: Muranyi, Arpad (arpad.muranyi@intel.com)
Date: Thu Jan 06 2000 - 12:46:53 PST


Along those lines I would add that a nominal X-Ohm trace can
have +/- several Ohms of variation due to even and odd mode
signaling. So a "50 Ohm" trace can easily show 48-52 Ohms of
impedance in such situations. So much for all the fuss about
matching the impedance of the driver and/or termination to the
line impedance precisely...

Arpad Muranyi
Intel Corporation
===================================================================

-----Original Message-----
From: Haller, Robert [mailto:Robert.Haller@compaq.com]
Sent: Thursday, January 06, 2000 11:35 AM
To: 'si-list@silab.eng.sun.com'
Subject: RE: [SI-LIST] : What's your favourite Screwy SI Concept?

Ok, I'll bite too.

Reporting the impedance of a PCB trace at 50.123 Ohms when measurement
accuracy is +/- .5 ohms at best.

Using a 40 ps TDR edge to measure propagation delay for a considerably
slower application.

Bob Haller
Compaq Computer Corporation

>Subject: [SI-LIST] : What's your favourite Screwy SI Concept?
>Cheers,
>Andrew Phillips
>Supercomputing Systems AG
>Zurich, Switzerland

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